UNACCEPTABLE SERVICE & REPEATED ERRORS - BEWARE

I'm writing to express my extreme dissatisfaction with the handling of my account. Despite my explicit instruction to maintain the original debit order date, you changed it resulting in a failed payment. You then rectified it in February by debiting R120,after I had queried. however in March you debited the correct amount on the 25th Mar and again on the 27th Mar R59 was debited. Your agent's response was not acceptable, telling me "let's not go back and forth about this" How can I NOT, having to call you every time you messing with my bank, because you have access to my bank account does not give you the right to do as you please.